If the earth is orbitting the sun at thousands of miles per hour...Why do we not all fly off into space?
The force of gravity in your hypothetical round earth, is only 9.8 meters per second. Yet...the earth orbits the sun at thousands of meters per second!
That would be like trying to hold unto a merry go round, going thousands of miles per hour, with only a fridge magnet!
Explain yourselves, 'round earthers'.
Ugh... Your posts have so many inaccuracies that it will take me a long post to point them all out (please don't take offense, I don't mean to be rude or anything). Anyway, I will give you the "short" answer (and please reply if you disagree with it):
We can't feel the centrifugal "force" (you are right that it is not actually a force in its own, it's merely the "reaction" to the centripetal force, which is the force that prevents the object for flying away. Example: when swinging a rock with a rope, the rope exerts the centripetal force, and the centrifugal "force" is what seems to make the rock "want" to fling away, although it's actually the inertia. The use of the word is actually a mere convention, just like "g-force" is merely acceleration divided by the acceleration of gravity, just to put into perspective the force of that acceleration) because... well... the centripetal force is being applied on our entire bodies, every single molecule of them. I have to ask you, what keeps the earth revolving and not flying away? "The sun's gravitational attraction", you will say. So, gravity is the centripetal force here. Remember, gravity is applied on EVERY BODY WITH A NON ZERO MASS. What does that mean? The exact same force that is applied to the earth to prevent it from flying away is applied on us to prevent us from flying away. If the earth were to suddenly disappear, we would keep revolving around the sun. It's like being inside a free-falling, totally opaque elevator. Say you were born in one. Would you have any way of knowing that you are actually accelerating? No. It would be identical to being in 0 gravity, because the elevator below you (and above you) would be accelerating due to gravity exactly as much as you would be accelerating due to gravity. The sun accelerates the earth exactly as much as it accelerates you. Thus, you don't feel anything.
Now for the other question: why don't we fly off of the surface of earth because of its spin/why don't the oceans migrate to the equator? The Earth at the equator is spinning at about 460 meters per second at the equator. Its radius is about 6,400,000 meters. The formula for the centripetal acceleration (and, therefore, for the centrifugal acceleration) is a=v^2/r, where a is the acceleration, v is the velocity, and r is the radius. Do the math. Actually, no, I already did them for you. The acceleration is about 0.033m/s^2. The acceleration of earth is about 9.8m/s^2. Don't worry, you're not going to fly off into space any time soon
I hope you realized your mistake. After all, we learn from them